The only supplement I know of that has scientific data showing regeneration of cartilage is Hydrolyzed Collagen Type 2... it was used for that purpose upto 10g a day with no negative side effects shown... It's pretty exspensive but i have a boatload left over from the lean beef amino production that i won't be needing anymore... if u or anyone else on here wants some, message me and I'll hook you up with some better pricing than u will find anywhere else
Also, what is your opinion on the stem cell procedure? I have a friend that goes to Mexico once a month now but it's like 7g per treatment